resolver.5: Fix example Google DNS server address

MFC after: 3 days
Signed-off-by: Paula Breton <git@breton.xyz>

(cherry picked from commit e7f0f4f9206e8b0f411847b293c7b79eb84f0e51)
(cherry picked from commit 3e3e2c6328475ab8460f6f57aa2696c544d9ddec)

Approved by: re (cperciva)